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Thermocoupling burns out every 7-10 days?

Coleman heater model # 7975A856 serial # 038972806

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If your thermocouple is literally burning out, then have the pilot assembly checked and clean, check the orifice and the gas pressure to the pilot. Make sure the orifice size is correct for what type of fuel you are using (liquid propane or natural gas). Worst case you could have a gas valve or regulator going bad. Please have this done by a qualified service technician. I hope this helps.

Posted on Dec 02, 2008

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Hello, this could be a problem with the thermocouple or gas valve. Start by replacing the thermocouple since it is very inexpensive, if that does not get it going sounds like the gas valve will need to be replaced

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Coleman heater model 5445c700 propane camp heater wont light. It did work fine. When I hold the knob in the light position you can hear gas but it barely ignites then goes out. I've tried new gas and...


If you're using a 20lb propane tank (Gas Grill Tank), that may be the problem. Turn off the propane tank at the tank valve and disconnect it from the tank. Wait 5 minutes and reattach the heater hose to the tank. Turn the propane tank valve on very,very slowly until it's all the way open. Try lighting your heater now. If the pilot flame height returned to normal, that was the problem.

FYI - The Thermocouple has nothing to do with the length of the pilot flame. It's a safety feature that stops the gas if the pilot flame goes out for any reason.

Hope that solves your problem. Please let me know.

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1 Answer

My heater will light and burn steadily for about 2 minutes and then it just turns off, even the pilot light. What is causing this?


Sounds like the Thermocouple is going bad. Or, since it's Propane, he Thermocouple has a lacquered finish on it from the propane. If so, locate the Thermocouple (see your Owners Manual) and using a strip of fine sand paper, polish the Thermocouple thoroughly. You don't want to actually sand it, as much as polish it. Then wipe off the Thermocouple with a cotton ball soaked in alcohol. Allow the alcohol to evaporate before attempting to light the pilot.

Also your should trace the Thermocouple wire back to where it enters the control valve. Try loosening the nut with your fingers. If it does loosen, finger tighten it and with the appropriately sized open wrench, tighten it only a 1/4 turn more.

If either of the trouble shooting suggestions don't solve your problem, the Thermocouple will have to be replace. You can buy one directly from Coleman online. Make sure you have your Model # & Serial # before ordering.

Hope this helps. Please let me know.

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I have a few issues with an old probably dinosaur Coleman Presidential III 7995a-856 Heating unit. I've had 3 different repairmen look at it and they're clueless. The main pilot will light and stay lit...


if the pilot is clean and and strong then this should play on to the thermocouple , i take it you have changed the thermocouple , and the connection is good at the gas valve , then if this going out could be 1, powerunit on gas valve not holding at thermocouple connection

2. Hole in heatexchanger blowing out pilot when blower comes on

I take it the pilot stays on untill fan comes on and keeps going out , I would think about not putting any more money in to this and get new if sounds as the heater has had its day ,

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Typically, if you have replaced the thermocoupling and are still experiencing problems, it means the master control valve is bad. It also may be a venting problem, which I would not rule out. If you call the manufacturer with model and serial number, they will be able to help you better diagnose your problem.

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Go to www.grainger.com and look for a "power pile generator" this is a millivolt thermocouple that may be just what you need to make your heater work again

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1 Answer

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There is a thermocouple "wire" that is supposed to be touching the pilot flame.
The thermocouple senses a flame (hot) and allows the heater to operate. If the thermocouple does not sense that the pilot is on, then it will not allow the furnace to operate.
Bend the thermocouple wire (or the pilot tube) so that the pilot flame is touchingg the thermocouple.

That shouls work now.

The air from the fan should not be blowing through the same cxavity that the pilot is in.
If it is, then you may have a leaking furnace whereby carbon monoxide may be seeping into your living quarters.
If the fix above works and the pilot stays on after the heater starts, then there is probably no leak.

Let us know the results ... post a comment or "RATE" this or another expert's solution.

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These heaters are not designed to be operated below 40 degrees F. If the heater is used below 40 and if you have a gas tank containing less than 25%, the unit will not operate for long and will start going out. If the heater all of a sudden goes out without showing any flickering or pulsations, you have a bad gas valve, there is no thermocouple on this model. Fill your tank and try the heater again. If it continues, give Coleman a call at 800-835-3278.

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